#include <Wire.h>
#include <LiquidCrystal_I2C.h> 
LiquidCrystal_I2C lcd = LiquidCrystal_I2C(0x27, 24, 4);  //D4 =SDA D3=SCL
 
 // Copin Slot
int coinPin = 2;            // Coin slot pulse input 
int timePerCoin = 1;       // 24(actual) Seconds per coin 
volatile int pulseCount = 0;
int coinSlotStatus;  

unsigned long timerSeconds,timerSecondsS = 0; 
unsigned long lastPulseTime,lastPulseTimeS = 0;
unsigned int creditCoin,creditCoinS = 0;   
int pulseCoin,pulseCoinS;   

boolean userBalance = false;
boolean noCoin = false; 
 
#define buzzer 12 
//Relay
int relayPins[] = {11,10,9,8};  
int totalRelays = 4; 
//Buttons
 const int buttonPins[] = {7,6,5,A3,A2,A1}; 
const int numButtons = 4;
//Servo
#include <Servo.h>
Servo servo1;  
Servo servo2;   
  
const uint8_t RELAY_ON = LOW;
const uint8_t RELAY_OFF = HIGH;
String btnFunction; 

 
int  waterStart,displayNa;
  

void setup() {
  Serial.begin(9600);

  pinMode(coinPin, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(coinPin), countPulse, FALLING);
  Serial.println("Coin Timer Ready...");
 

  servo1.attach(3);   
  servo2.attach(4); 
   
  lcd.init();   // initializing the LCD
  lcd.backlight(); 
  lcd.clear(); 
  lcdDisplay("     WELCOME TO" ," AUTOMATED CAR WASH" ,   "    MACHINE SYSTEM","");
  delay(2000);
  pinMode(buzzer,OUTPUT); 
  
  buzzMe(2); 

  //Relay  OFF
    for (int i = 0; i < totalRelays; i++) {
    pinMode(relayPins[i], OUTPUT);
    digitalWrite(relayPins[i], RELAY_OFF);  // Make sure all relays are OFF initially
  } 
  //Buttons
  for (int i = 0; i < numButtons; i++) {
      pinMode(buttonPins[i], INPUT_PULLUP);  // Button between pin & GND 
    } 

 btnFunction="Ready";

}


void loop() {
  displayNa+=1;
  if(displayNa>=100){
     lcdDisplay("Selected: " + btnFunction , "Wash: " + String(creditCoin) ,"Soap: " +  String(creditCoinS) ,"");
 
     displayNa=0;
  }
  //Button
  for (int i = 0; i < numButtons; i++) {
    int state = digitalRead(buttonPins[i]);
    if (state == LOW) { // pressed 
      buzzMe(1);
       if(i==0){
        Serial.println("0");  
        btnFunction="Soap";
       }else if(i==1){
        Serial.println("1"); 
        btnFunction="Cancel"; 
       }else if(i==2){
        Serial.println("2");  
        btnFunction="Wash";
         }else if(i==3){
        Serial.println("3");  
        btnFunction="Start";
       timerSeconds = timePerCoin  * creditCoin;  
       timerSecondsS = timePerCoin  * creditCoinS; 
       waterStart=1;
        digitalWrite(relayPins[0], RELAY_OFF);  
       } 
       
    } 
  }
  
 
   if(!noCoin ){ 
    noCoin = true; 
   
  }else{ 
    coinSlotStatus=digitalRead(coinPin); 
    delay(30);  
    if(coinSlotStatus == 0){ 
      if(btnFunction=="Soap"){
        pulseCoinS+=1; 
      creditCoinS=pulseCoinS;
      }else{
        pulseCoin+=1; 
      creditCoin=pulseCoin;
      btnFunction="Water";
      }
      
      delay(30);  
    }else{
      
    }
  }

  Serial.print("W:"); 
  Serial.print(creditCoin); 
  Serial.print("S:"); 
  Serial.println(creditCoinS); 
  
  if(btnFunction=="Start"){
    // ----- TIMER COUNTDOWN -----
    static unsigned long lastTick = 0;
    if (millis() - lastTick >= 1000) {
      lastTick = millis();

if( pulseCoin>0 ||  pulseCoinS >0){
       lcd.setCursor(11, 1);
      lcd.print(timerSeconds);  
      lcd.setCursor(11, 2);
      lcd.print(timerSecondsS);  
      
   if(waterStart==1){ 
        if (timerSeconds > 0) {
          timerSeconds--;
          digitalWrite(relayPins[3], RELAY_ON); // Relay ON
        } else {
          digitalWrite(relayPins[3], RELAY_OFF);  // Relay OFF
           pulseCoin=0; 
          creditCoin=pulseCoin;
          waterStart=0;
        }
    
        Serial.print("Time left Water : ");
        Serial.println(timerSeconds); 
        
   }else{ 
  
        if (timerSecondsS > 0) {
          timerSecondsS--;
          digitalWrite(relayPins[3], RELAY_ON); // Relay ON
        } else {
          digitalWrite(relayPins[3], RELAY_OFF);  // Relay OFF
           pulseCoinS=0; 
          creditCoinS=pulseCoinS; 
        }
    
        Serial.print("Time left Soap : ");
        Serial.println(timerSecondsS); 
        
   }
   
  }else{
    btnFunction="Ready";
  }
 
    }
    
  }


if(btnFunction=="Ready"){ 
  //Start Coin Relay 
  digitalWrite(relayPins[0], RELAY_ON); // Relay ON
}

if(btnFunction=="Cancel"){ 
  creditCoin=0;creditCoinS=0; 
}
 
  //Serial.println(btnFunction);
  //lcdDisplay("Selected: " + btnFunction , "Wash: " + String(creditCoin) ,"Soap: " +  String(creditCoinS) ,"");
}